/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */
package org.apache.iotdb.jdbc;

import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.math.BigDecimal;

public class StringUtils {

    private static byte[] allBytes = new byte[256];

    private static char[] byteToChars = new char[256];

    private static Method toPlainStringMethod;

    static final int WILD_COMPARE_MATCH_NO_WILD = 0;

    static final int WILD_COMPARE_MATCH_WITH_WILD = 1;

    static final int WILD_COMPARE_NO_MATCH = -1;

    static {
        for (int i = -128; i <= 127; i++) {
            allBytes[i - -128] = (byte) i;
        }
        String allBytesString = new String(allBytes, 0, 255);
        int allBytesStringLen = allBytesString.length();
        int j = 0;
        for (; j < 255 && j < allBytesStringLen; j++) {
            byteToChars[j] = allBytesString.charAt(j);
        }
        try {
            toPlainStringMethod = BigDecimal.class.getMethod("toPlainString", new Class[0]);
        } catch (NoSuchMethodException nsme) {
        }
    }

    public static String consistentToString(BigDecimal decimal) {
        if (decimal == null) {
            return null;
        }
        if (toPlainStringMethod != null) {
            try {
                return (String) toPlainStringMethod.invoke(decimal, null);
            } catch (InvocationTargetException invokeEx) {

            } catch (IllegalAccessException accessEx) {
            }
        }
        return decimal.toString();
    }

    public static final String fixDecimalExponent(String dString) {
        int ePos = dString.indexOf("E");
        if (ePos == -1) {
            ePos = dString.indexOf("e");
        }
        if (ePos != -1 && dString.length() > ePos + 1) {
            char maybeMinusChar = dString.charAt(ePos + 1);
            if (maybeMinusChar != '-' && maybeMinusChar != '+') {
                StringBuffer buf = new StringBuffer(dString.length() + 1);
                buf.append(dString.substring(0, ePos + 1));
                buf.append('+');
                buf.append(dString.substring(ePos + 1, dString.length()));
                dString = buf.toString();
            }
        }
        return dString;
    }
}
